Mercurial > hg
annotate mercurial/bdiff.c @ 13330:551856dea9a6 stable
win32mbcs: Fix typo in documentation
extention -> extension
author | Javi Merino <cibervicho@gmail.com> |
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date | Tue, 01 Feb 2011 07:29:11 +0000 |
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1 /* |
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2 bdiff.c - efficient binary diff extension for Mercurial |
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3 |
2859 | 4 Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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5 |
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6 This software may be used and distributed according to the terms of |
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7 the GNU General Public License, incorporated herein by reference. |
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8 |
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9 Based roughly on Python difflib |
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10 */ |
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11 |
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12 #include <Python.h> |
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13 #include <stdlib.h> |
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14 #include <string.h> |
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15 #include <limits.h> |
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16 |
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17 #if defined __hpux || defined __SUNPRO_C || defined _AIX |
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18 #define inline |
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19 #endif |
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20 |
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21 #ifdef __linux |
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22 #define inline __inline |
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23 #endif |
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24 |
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25 #ifdef _WIN32 |
551 | 26 #ifdef _MSC_VER |
27 #define inline __inline | |
28 typedef unsigned long uint32_t; | |
29 #else | |
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30 #include <stdint.h> |
551 | 31 #endif |
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32 static uint32_t htonl(uint32_t x) |
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33 { |
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34 return ((x & 0x000000ffUL) << 24) | |
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35 ((x & 0x0000ff00UL) << 8) | |
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36 ((x & 0x00ff0000UL) >> 8) | |
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37 ((x & 0xff000000UL) >> 24); |
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38 } |
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39 #else |
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40 #include <sys/types.h> |
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41 #if defined __BEOS__ && !defined __HAIKU__ |
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42 #include <ByteOrder.h> |
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43 #else |
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44 #include <arpa/inet.h> |
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45 #endif |
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46 #include <inttypes.h> |
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47 #endif |
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48 |
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49 #include "util.h" |
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50 |
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51 struct line { |
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52 int h, len, n, e; |
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53 const char *l; |
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54 }; |
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55 |
474 | 56 struct pos { |
57 int pos, len; | |
58 }; | |
59 | |
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60 struct hunk { |
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61 int a1, a2, b1, b2; |
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62 }; |
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63 |
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64 struct hunklist { |
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65 struct hunk *base, *head; |
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66 }; |
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67 |
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68 int splitlines(const char *a, int len, struct line **lr) |
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69 { |
5342 | 70 int h, i; |
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71 const char *p, *b = a; |
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72 const char * const plast = a + len - 1; |
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73 struct line *l; |
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74 |
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75 /* count the lines */ |
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76 i = 1; /* extra line for sentinel */ |
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77 for (p = a; p < a + len; p++) |
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78 if (*p == '\n' || p == plast) |
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79 i++; |
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80 |
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81 *lr = l = (struct line *)malloc(sizeof(struct line) * i); |
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82 if (!l) |
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83 return -1; |
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84 |
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85 /* build the line array and calculate hashes */ |
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86 h = 0; |
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87 for (p = a; p < a + len; p++) { |
5342 | 88 /* Leonid Yuriev's hash */ |
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89 h = (h * 1664525) + *p + 1013904223; |
5342 | 90 |
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91 if (*p == '\n' || p == plast) { |
5342 | 92 l->h = h; |
93 h = 0; | |
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94 l->len = p - b + 1; |
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95 l->l = b; |
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96 l->n = INT_MAX; |
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97 l++; |
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98 b = p + 1; |
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99 } |
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100 } |
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101 |
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102 /* set up a sentinel */ |
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103 l->h = l->len = 0; |
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104 l->l = a + len; |
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105 return i - 1; |
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106 } |
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107 |
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108 int inline cmp(struct line *a, struct line *b) |
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109 { |
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110 return a->h != b->h || a->len != b->len || memcmp(a->l, b->l, a->len); |
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111 } |
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112 |
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113 static int equatelines(struct line *a, int an, struct line *b, int bn) |
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114 { |
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115 int i, j, buckets = 1, t, scale; |
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116 struct pos *h = NULL; |
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117 |
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118 /* build a hash table of the next highest power of 2 */ |
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119 while (buckets < bn + 1) |
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120 buckets *= 2; |
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121 |
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122 /* try to allocate a large hash table to avoid collisions */ |
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123 for (scale = 4; scale; scale /= 2) { |
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124 h = (struct pos *)malloc(scale * buckets * sizeof(struct pos)); |
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125 if (h) |
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126 break; |
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127 } |
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128 |
474 | 129 if (!h) |
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130 return 0; |
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131 |
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132 buckets = buckets * scale - 1; |
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133 |
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134 /* clear the hash table */ |
474 | 135 for (i = 0; i <= buckets; i++) { |
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136 h[i].pos = INT_MAX; |
474 | 137 h[i].len = 0; |
138 } | |
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139 |
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140 /* add lines to the hash table chains */ |
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141 for (i = bn - 1; i >= 0; i--) { |
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142 /* find the equivalence class */ |
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143 for (j = b[i].h & buckets; h[j].pos != INT_MAX; |
474 | 144 j = (j + 1) & buckets) |
145 if (!cmp(b + i, b + h[j].pos)) | |
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146 break; |
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147 |
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148 /* add to the head of the equivalence class */ |
474 | 149 b[i].n = h[j].pos; |
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150 b[i].e = j; |
474 | 151 h[j].pos = i; |
152 h[j].len++; /* keep track of popularity */ | |
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153 } |
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154 |
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155 /* compute popularity threshold */ |
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156 t = (bn >= 31000) ? bn / 1000 : 1000000 / (bn + 1); |
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157 |
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158 /* match items in a to their equivalence class in b */ |
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159 for (i = 0; i < an; i++) { |
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160 /* find the equivalence class */ |
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161 for (j = a[i].h & buckets; h[j].pos != INT_MAX; |
474 | 162 j = (j + 1) & buckets) |
163 if (!cmp(a + i, b + h[j].pos)) | |
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164 break; |
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165 |
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166 a[i].e = j; /* use equivalence class for quick compare */ |
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167 if (h[j].len <= t) |
474 | 168 a[i].n = h[j].pos; /* point to head of match list */ |
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169 else |
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170 a[i].n = INT_MAX; /* too popular */ |
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171 } |
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172 |
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173 /* discard hash tables */ |
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174 free(h); |
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175 return 1; |
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176 } |
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177 |
474 | 178 static int longest_match(struct line *a, struct line *b, struct pos *pos, |
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179 int a1, int a2, int b1, int b2, int *omi, int *omj) |
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180 { |
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181 int mi = a1, mj = b1, mk = 0, mb = 0, i, j, k; |
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182 |
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183 for (i = a1; i < a2; i++) { |
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184 /* skip things before the current block */ |
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185 for (j = a[i].n; j < b1; j = b[j].n) |
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186 ; |
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187 |
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188 /* loop through all lines match a[i] in b */ |
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189 for (; j < b2; j = b[j].n) { |
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190 /* does this extend an earlier match? */ |
474 | 191 if (i > a1 && j > b1 && pos[j - 1].pos == i - 1) |
192 k = pos[j - 1].len + 1; | |
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193 else |
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194 k = 1; |
474 | 195 pos[j].pos = i; |
196 pos[j].len = k; | |
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197 |
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198 /* best match so far? */ |
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199 if (k > mk) { |
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200 mi = i; |
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201 mj = j; |
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202 mk = k; |
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203 } |
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204 } |
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205 } |
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206 |
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207 if (mk) { |
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208 mi = mi - mk + 1; |
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209 mj = mj - mk + 1; |
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210 } |
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211 |
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212 /* expand match to include neighboring popular lines */ |
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213 while (mi - mb > a1 && mj - mb > b1 && |
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214 a[mi - mb - 1].e == b[mj - mb - 1].e) |
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215 mb++; |
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216 while (mi + mk < a2 && mj + mk < b2 && |
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217 a[mi + mk].e == b[mj + mk].e) |
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218 mk++; |
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219 |
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220 *omi = mi - mb; |
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221 *omj = mj - mb; |
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222 |
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223 return mk + mb; |
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224 } |
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225 |
474 | 226 static void recurse(struct line *a, struct line *b, struct pos *pos, |
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227 int a1, int a2, int b1, int b2, struct hunklist *l) |
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228 { |
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229 int i, j, k; |
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230 |
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231 while (1) { |
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232 /* find the longest match in this chunk */ |
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233 k = longest_match(a, b, pos, a1, a2, b1, b2, &i, &j); |
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234 if (!k) |
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235 return; |
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236 |
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237 /* and recurse on the remaining chunks on either side */ |
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238 recurse(a, b, pos, a1, i, b1, j, l); |
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239 l->head->a1 = i; |
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240 l->head->a2 = i + k; |
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241 l->head->b1 = j; |
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242 l->head->b2 = j + k; |
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243 l->head++; |
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244 /* tail-recursion didn't happen, so doing equivalent iteration */ |
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245 a1 = i + k; |
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246 b1 = j + k; |
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247 } |
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248 } |
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249 |
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250 static struct hunklist diff(struct line *a, int an, struct line *b, int bn) |
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251 { |
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252 struct hunklist l; |
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253 struct hunk *curr; |
474 | 254 struct pos *pos; |
255 int t; | |
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256 |
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257 /* allocate and fill arrays */ |
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258 t = equatelines(a, an, b, bn); |
5571 | 259 pos = (struct pos *)calloc(bn ? bn : 1, sizeof(struct pos)); |
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260 /* we can't have more matches than lines in the shorter file */ |
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261 l.head = l.base = (struct hunk *)malloc(sizeof(struct hunk) * |
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262 ((an<bn ? an:bn) + 1)); |
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263 |
474 | 264 if (pos && l.base && t) { |
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265 /* generate the matching block list */ |
474 | 266 recurse(a, b, pos, 0, an, 0, bn, &l); |
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267 l.head->a1 = l.head->a2 = an; |
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268 l.head->b1 = l.head->b2 = bn; |
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269 l.head++; |
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270 } |
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271 |
474 | 272 free(pos); |
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273 |
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274 /* normalize the hunk list, try to push each hunk towards the end */ |
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275 for (curr = l.base; curr != l.head; curr++) { |
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276 struct hunk *next = curr + 1; |
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277 int shift = 0; |
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278 |
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279 if (next == l.head) |
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280 break; |
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281 |
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282 if (curr->a2 == next->a1) |
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283 while (curr->a2 + shift < an && curr->b2 + shift < bn |
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284 && !cmp(a + curr->a2 + shift, |
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285 b + curr->b2 + shift)) |
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286 shift++; |
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287 else if (curr->b2 == next->b1) |
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288 while (curr->b2 + shift < bn && curr->a2 + shift < an |
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289 && !cmp(b + curr->b2 + shift, |
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290 a + curr->a2 + shift)) |
7104
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291 shift++; |
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292 if (!shift) |
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293 continue; |
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294 curr->b2 += shift; |
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295 next->b1 += shift; |
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296 curr->a2 += shift; |
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297 next->a1 += shift; |
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298 } |
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299 |
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300 return l; |
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301 } |
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302 |
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303 static PyObject *blocks(PyObject *self, PyObject *args) |
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304 { |
435 | 305 PyObject *sa, *sb, *rl = NULL, *m; |
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306 struct line *a, *b; |
970 | 307 struct hunklist l = {NULL, NULL}; |
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308 struct hunk *h; |
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309 int an, bn, pos = 0; |
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310 |
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311 if (!PyArg_ParseTuple(args, "SS:bdiff", &sa, &sb)) |
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312 return NULL; |
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313 |
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314 an = splitlines(PyBytes_AsString(sa), PyBytes_Size(sa), &a); |
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315 bn = splitlines(PyBytes_AsString(sb), PyBytes_Size(sb), &b); |
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316 |
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317 if (!a || !b) |
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318 goto nomem; |
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319 |
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320 l = diff(a, an, b, bn); |
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321 rl = PyList_New(l.head - l.base); |
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322 if (!l.head || !rl) |
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323 goto nomem; |
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324 |
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325 for (h = l.base; h != l.head; h++) { |
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326 m = Py_BuildValue("iiii", h->a1, h->a2, h->b1, h->b2); |
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327 PyList_SetItem(rl, pos, m); |
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328 pos++; |
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329 } |
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330 |
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331 nomem: |
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332 free(a); |
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333 free(b); |
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334 free(l.base); |
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335 return rl ? rl : PyErr_NoMemory(); |
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336 } |
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337 |
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338 static PyObject *bdiff(PyObject *self, PyObject *args) |
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339 { |
3335
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Teach bdiff to support buffer objects
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340 char *sa, *sb; |
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341 PyObject *result = NULL; |
433
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342 struct line *al, *bl; |
970 | 343 struct hunklist l = {NULL, NULL}; |
433
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344 struct hunk *h; |
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345 char encode[12], *rb; |
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346 int an, bn, len = 0, la, lb; |
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347 |
3369
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python2.5 PyArg_ParseTuple fix
Alexis S. L. Carvalho <alexis@cecm.usp.br>
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348 if (!PyArg_ParseTuple(args, "s#s#:bdiff", &sa, &la, &sb, &lb)) |
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349 return NULL; |
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350 |
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351 an = splitlines(sa, la, &al); |
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352 bn = splitlines(sb, lb, &bl); |
433
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353 if (!al || !bl) |
400
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354 goto nomem; |
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355 |
433
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356 l = diff(al, an, bl, bn); |
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357 if (!l.head) |
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358 goto nomem; |
400
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359 |
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360 /* calculate length of output */ |
3335
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361 la = lb = 0; |
1542
8e80eefb3de6
made C src formatting more consistent
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362 for (h = l.base; h != l.head; h++) { |
400
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363 if (h->a1 != la || h->b1 != lb) |
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364 len += 12 + bl[h->b1].l - bl[lb].l; |
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365 la = h->a2; |
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366 lb = h->b2; |
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367 } |
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368 |
11364
0044193a1c45
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Renato Cunha <renatoc@gmail.com>
parents:
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changeset
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369 result = PyBytes_FromStringAndSize(NULL, len); |
0044193a1c45
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370 |
400
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371 if (!result) |
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|
372 goto nomem; |
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373 |
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374 /* build binary patch */ |
11364
0044193a1c45
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375 rb = PyBytes_AsString(result); |
400
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376 la = lb = 0; |
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377 |
1542
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made C src formatting more consistent
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378 for (h = l.base; h != l.head; h++) { |
400
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379 if (h->a1 != la || h->b1 != lb) { |
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380 len = bl[h->b1].l - bl[lb].l; |
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381 *(uint32_t *)(encode) = htonl(al[la].l - al->l); |
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382 *(uint32_t *)(encode + 4) = htonl(al[h->a1].l - al->l); |
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383 *(uint32_t *)(encode + 8) = htonl(len); |
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384 memcpy(rb, encode, 12); |
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385 memcpy(rb + 12, bl[lb].l, len); |
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386 rb += 12 + len; |
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|
387 } |
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388 la = h->a2; |
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389 lb = h->b2; |
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|
390 } |
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changeset
|
391 |
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parents:
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changeset
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392 nomem: |
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changeset
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393 free(al); |
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|
394 free(bl); |
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395 free(l.base); |
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|
396 return result ? result : PyErr_NoMemory(); |
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|
397 } |
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|
398 |
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399 static char mdiff_doc[] = "Efficient binary diff."; |
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|
400 |
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401 static PyMethodDef methods[] = { |
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402 {"bdiff", bdiff, METH_VARARGS, "calculate a binary diff\n"}, |
433
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Add bdiff.blocks / minor performance tweaks
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411
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changeset
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403 {"blocks", blocks, METH_VARARGS, "find a list of matching lines\n"}, |
400
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|
404 {NULL, NULL} |
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|
405 }; |
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|
406 |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
407 #ifdef IS_PY3K |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
408 static struct PyModuleDef bdiff_module = { |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
409 PyModuleDef_HEAD_INIT, |
0044193a1c45
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Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
410 "bdiff", |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
411 mdiff_doc, |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
412 -1, |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
413 methods |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
414 }; |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
415 |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
416 PyMODINIT_FUNC PyInit_bdiff(void) |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
417 { |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
418 return PyModule_Create(&bdiff_module); |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
419 } |
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
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changeset
|
420 #else |
400
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|
421 PyMODINIT_FUNC initbdiff(void) |
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422 { |
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423 Py_InitModule3("bdiff", methods, mdiff_doc); |
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|
424 } |
11364
0044193a1c45
bdiff.c: Added support for py3k.
Renato Cunha <renatoc@gmail.com>
parents:
10500
diff
changeset
|
425 #endif |
1542
8e80eefb3de6
made C src formatting more consistent
twaldmann@thinkmo.de
parents:
1397
diff
changeset
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426 |